What are the two main reasons synchronized sound, specifically dialogue, was difficult early on?

A sound film is a motion picture with synchronized sound, or sound technologically coupled to image, as opposed to a silent film. ... At first, the sound films which included synchronized dialogue, known as "talking pictures", or "talkies", were exclusively shorts.

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the answer is counterpoint.

counterpoint definition: "the art or technique of playing a melody or melodies in conjunction with another, according to fixed rules."

counterpoint is present in a lot of baroque music- such as bach (notably his wtc prelude and fugues) and scarlatti, but can also be found in music by mozart, beethoven. it can even be found in music as modern as john williams!